Ok I finally have purchased the XBox live communicator and now I need to buy some games to play on line. I noticed that there are quite a few of you who are using XBox live so I thought I would ask for some recommendations. I noticed that Mechassualt is down to $19.99. I've read that the single player mode is not that strong but is it worth it for the on-line gaming? I enjoy shooting games, so in short which games are worth at least rentals, although I prefer purchasing in the long run. Thanks in advance for any recommendations.